Martinez, A. T. and Almendros, G. and Gonzalez-Vila, F. J. and Fründ, R. (1999) Solid-state spectroscopic analysis of lignins from several Austral hardwoods. SOLID STATE NUCLEAR MAGNETIC RESONANCE, 15 (1). pp. 41-48. ISSN 0926-2040, 1527-3326
Full text not available from this repository. (Request a copy)Abstract
In order to gain information about lignin molecular characteristics with a direct bearing on the remarkable susceptibility of some Austral hardwoods to biological delignification, milled-wood lignins were isolated and analyzed by spectroscopic techniques in the solid state. Cross polarization and magic-angle spinning C-13 nuclear magnetic resonance (C-13 CPMAS NMR) and Fourier-transform infrared (FTIR) spectra of the lignin preparations were obtained. The most diagnostic peaks were assigned and quantified as percentages of the total spectral area, and the differences observed discussed in terms of lignin composition. The spectral patterns obtained revealed that the woods from Gevuina avellana, Eucryphia cordifolia and Nothofagus dombeyii have lignin with high syringyl/guaiacyl ratio, as evidenced by relative areas of C-13 NMR signals at 153 and 148 ppm, and FTIR bands at 1335 and 1275 cm(-1). The presence of syringyl-rich lignins, characterized by lower redox potential and condensation degree than guaiacyl-rich lignins, could be a structural factor contributing to the ease of extensive delignification of these woods by white-rot fungi. (C) 1999 Elsevier Science B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MAGNETIC-RESONANCE SPECTROSCOPY; FT-IR SPECTROSCOPY; C-13 NMR-SPECTRA; WHITE-ROT FUNGI; PALO-PODRIDO; WHEAT-STRAW; STRUCTURAL DIFFERENCES; ANALYTICAL PYROLYSIS; GANODERMA-AUSTRALE; CUO-OXIDATION; lignin; syringyl/guaiacyl ratio; wood; Eucryphia cordifolia; Gevuina avellana; Nothofagus dombeyii; Laurelia philippiana; Aextoxicum punctatum; C-13 CPMAS NMR; FTIR; biodegradation; fungi; delignification |
| Subjects: | 500 Science > 530 Physics 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Dec 2022 05:26 |
| Last Modified: | 21 Dec 2022 05:26 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48980 |
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